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Operating Segments, Geographic Information and Significant Customers (Schedule Of Long-Lived Assets By Geographical Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Total $ 33,426 $ 32,553
United States    
Segment Reporting Information [Line Items]    
Total 32,876 32,162
China    
Segment Reporting Information [Line Items]    
Total $ 550 $ 391